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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.GwtCompatible;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.primitives.Ints;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.Serializable;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.ArrayList;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Arrays;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.Collection;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Collections;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Iterator;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.List;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>import javax.annotation.Nullable;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>/**<a name="line.34"></a>
<span class="sourceLineNo">035</span> * An immutable hash-based multiset. Does not permit null elements.<a name="line.35"></a>
<span class="sourceLineNo">036</span> *<a name="line.36"></a>
<span class="sourceLineNo">037</span> * &lt;p&gt;Its iterator orders elements according to the first appearance of the<a name="line.37"></a>
<span class="sourceLineNo">038</span> * element among the items passed to the factory method or builder. When the<a name="line.38"></a>
<span class="sourceLineNo">039</span> * multiset contains multiple instances of an element, those instances are<a name="line.39"></a>
<span class="sourceLineNo">040</span> * consecutive in the iteration order.<a name="line.40"></a>
<span class="sourceLineNo">041</span> *<a name="line.41"></a>
<span class="sourceLineNo">042</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.42"></a>
<span class="sourceLineNo">043</span> * "http://code.google.com/p/guava-libraries/wiki/ImmutableCollectionsExplained"&gt;<a name="line.43"></a>
<span class="sourceLineNo">044</span> * immutable collections&lt;/a&gt;.<a name="line.44"></a>
<span class="sourceLineNo">045</span> *<a name="line.45"></a>
<span class="sourceLineNo">046</span> * @author Jared Levy<a name="line.46"></a>
<span class="sourceLineNo">047</span> * @author Louis Wasserman<a name="line.47"></a>
<span class="sourceLineNo">048</span> * @since 2.0 (imported from Google Collections Library)<a name="line.48"></a>
<span class="sourceLineNo">049</span> */<a name="line.49"></a>
<span class="sourceLineNo">050</span>@GwtCompatible(serializable = true)<a name="line.50"></a>
<span class="sourceLineNo">051</span>@SuppressWarnings("serial") // we're overriding default serialization<a name="line.51"></a>
<span class="sourceLineNo">052</span>// TODO(user): write an efficient asList() implementation<a name="line.52"></a>
<span class="sourceLineNo">053</span>public abstract class ImmutableMultiset&lt;E&gt; extends ImmutableCollection&lt;E&gt;<a name="line.53"></a>
<span class="sourceLineNo">054</span>    implements Multiset&lt;E&gt; {<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>  /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>   * Returns the empty immutable multiset.<a name="line.57"></a>
<span class="sourceLineNo">058</span>   */<a name="line.58"></a>
<span class="sourceLineNo">059</span>  @SuppressWarnings("unchecked") // all supported methods are covariant<a name="line.59"></a>
<span class="sourceLineNo">060</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of() {<a name="line.60"></a>
<span class="sourceLineNo">061</span>    return (ImmutableMultiset&lt;E&gt;) EmptyImmutableMultiset.INSTANCE;<a name="line.61"></a>
<span class="sourceLineNo">062</span>  }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  /**<a name="line.64"></a>
<span class="sourceLineNo">065</span>   * Returns an immutable multiset containing a single element.<a name="line.65"></a>
<span class="sourceLineNo">066</span>   *<a name="line.66"></a>
<span class="sourceLineNo">067</span>   * @throws NullPointerException if {@code element} is null<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * @since 6.0 (source-compatible since 2.0)<a name="line.68"></a>
<span class="sourceLineNo">069</span>   */<a name="line.69"></a>
<span class="sourceLineNo">070</span>  @SuppressWarnings("unchecked") // generic array created but never written<a name="line.70"></a>
<span class="sourceLineNo">071</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of(E element) {<a name="line.71"></a>
<span class="sourceLineNo">072</span>    return copyOfInternal(element);<a name="line.72"></a>
<span class="sourceLineNo">073</span>  }<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>  /**<a name="line.75"></a>
<span class="sourceLineNo">076</span>   * Returns an immutable multiset containing the given elements, in order.<a name="line.76"></a>
<span class="sourceLineNo">077</span>   *<a name="line.77"></a>
<span class="sourceLineNo">078</span>   * @throws NullPointerException if any element is null<a name="line.78"></a>
<span class="sourceLineNo">079</span>   * @since 6.0 (source-compatible since 2.0)<a name="line.79"></a>
<span class="sourceLineNo">080</span>   */<a name="line.80"></a>
<span class="sourceLineNo">081</span>  @SuppressWarnings("unchecked") //<a name="line.81"></a>
<span class="sourceLineNo">082</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of(E e1, E e2) {<a name="line.82"></a>
<span class="sourceLineNo">083</span>    return copyOfInternal(e1, e2);<a name="line.83"></a>
<span class="sourceLineNo">084</span>  }<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>  /**<a name="line.86"></a>
<span class="sourceLineNo">087</span>   * Returns an immutable multiset containing the given elements, in order.<a name="line.87"></a>
<span class="sourceLineNo">088</span>   *<a name="line.88"></a>
<span class="sourceLineNo">089</span>   * @throws NullPointerException if any element is null<a name="line.89"></a>
<span class="sourceLineNo">090</span>   * @since 6.0 (source-compatible since 2.0)<a name="line.90"></a>
<span class="sourceLineNo">091</span>   */<a name="line.91"></a>
<span class="sourceLineNo">092</span>  @SuppressWarnings("unchecked") //<a name="line.92"></a>
<span class="sourceLineNo">093</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of(E e1, E e2, E e3) {<a name="line.93"></a>
<span class="sourceLineNo">094</span>    return copyOfInternal(e1, e2, e3);<a name="line.94"></a>
<span class="sourceLineNo">095</span>  }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>  /**<a name="line.97"></a>
<span class="sourceLineNo">098</span>   * Returns an immutable multiset containing the given elements, in order.<a name="line.98"></a>
<span class="sourceLineNo">099</span>   *<a name="line.99"></a>
<span class="sourceLineNo">100</span>   * @throws NullPointerException if any element is null<a name="line.100"></a>
<span class="sourceLineNo">101</span>   * @since 6.0 (source-compatible since 2.0)<a name="line.101"></a>
<span class="sourceLineNo">102</span>   */<a name="line.102"></a>
<span class="sourceLineNo">103</span>  @SuppressWarnings("unchecked") //<a name="line.103"></a>
<span class="sourceLineNo">104</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of(E e1, E e2, E e3, E e4) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>    return copyOfInternal(e1, e2, e3, e4);<a name="line.105"></a>
<span class="sourceLineNo">106</span>  }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span>  /**<a name="line.108"></a>
<span class="sourceLineNo">109</span>   * Returns an immutable multiset containing the given elements, in order.<a name="line.109"></a>
<span class="sourceLineNo">110</span>   *<a name="line.110"></a>
<span class="sourceLineNo">111</span>   * @throws NullPointerException if any element is null<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * @since 6.0 (source-compatible since 2.0)<a name="line.112"></a>
<span class="sourceLineNo">113</span>   */<a name="line.113"></a>
<span class="sourceLineNo">114</span>  @SuppressWarnings("unchecked") //<a name="line.114"></a>
<span class="sourceLineNo">115</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of(E e1, E e2, E e3, E e4, E e5) {<a name="line.115"></a>
<span class="sourceLineNo">116</span>    return copyOfInternal(e1, e2, e3, e4, e5);<a name="line.116"></a>
<span class="sourceLineNo">117</span>  }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span>  /**<a name="line.119"></a>
<span class="sourceLineNo">120</span>   * Returns an immutable multiset containing the given elements, in order.<a name="line.120"></a>
<span class="sourceLineNo">121</span>   *<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * @throws NullPointerException if any element is null<a name="line.122"></a>
<span class="sourceLineNo">123</span>   * @since 6.0 (source-compatible since 2.0)<a name="line.123"></a>
<span class="sourceLineNo">124</span>   */<a name="line.124"></a>
<span class="sourceLineNo">125</span>  @SuppressWarnings("unchecked") //<a name="line.125"></a>
<span class="sourceLineNo">126</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; of(<a name="line.126"></a>
<span class="sourceLineNo">127</span>      E e1, E e2, E e3, E e4, E e5, E e6, E... others) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>    int size = others.length + 6;<a name="line.128"></a>
<span class="sourceLineNo">129</span>    List&lt;E&gt; all = new ArrayList&lt;E&gt;(size);<a name="line.129"></a>
<span class="sourceLineNo">130</span>    Collections.addAll(all, e1, e2, e3, e4, e5, e6);<a name="line.130"></a>
<span class="sourceLineNo">131</span>    Collections.addAll(all, others);<a name="line.131"></a>
<span class="sourceLineNo">132</span>    return copyOf(all);<a name="line.132"></a>
<span class="sourceLineNo">133</span>  }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>  /**<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * Returns an immutable multiset containing the given elements.<a name="line.136"></a>
<span class="sourceLineNo">137</span>   *<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * &lt;p&gt;The multiset is ordered by the first occurrence of each element. For<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * example, {@code ImmutableMultiset.copyOf([2, 3, 1, 3])} yields a multiset<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * with elements in the order {@code 2, 3, 3, 1}.<a name="line.140"></a>
<span class="sourceLineNo">141</span>   *<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * @since 6.0<a name="line.143"></a>
<span class="sourceLineNo">144</span>   */<a name="line.144"></a>
<span class="sourceLineNo">145</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; copyOf(E[] elements) {<a name="line.145"></a>
<span class="sourceLineNo">146</span>    return copyOf(Arrays.asList(elements));<a name="line.146"></a>
<span class="sourceLineNo">147</span>  }<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>  /**<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * Returns an immutable multiset containing the given elements.<a name="line.150"></a>
<span class="sourceLineNo">151</span>   *<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * &lt;p&gt;The multiset is ordered by the first occurrence of each element. For<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * example, {@code ImmutableMultiset.copyOf(Arrays.asList(2, 3, 1, 3))} yields<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * a multiset with elements in the order {@code 2, 3, 3, 1}.<a name="line.154"></a>
<span class="sourceLineNo">155</span>   *<a name="line.155"></a>
<span class="sourceLineNo">156</span>   * &lt;p&gt;Despite the method name, this method attempts to avoid actually copying<a name="line.156"></a>
<span class="sourceLineNo">157</span>   * the data when it is safe to do so. The exact circumstances under which a<a name="line.157"></a>
<span class="sourceLineNo">158</span>   * copy will or will not be performed are undocumented and subject to change.<a name="line.158"></a>
<span class="sourceLineNo">159</span>   *<a name="line.159"></a>
<span class="sourceLineNo">160</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; Despite what the method name suggests, if {@code elements}<a name="line.160"></a>
<span class="sourceLineNo">161</span>   * is an {@code ImmutableMultiset}, no copy will actually be performed, and<a name="line.161"></a>
<span class="sourceLineNo">162</span>   * the given multiset itself will be returned.<a name="line.162"></a>
<span class="sourceLineNo">163</span>   *<a name="line.163"></a>
<span class="sourceLineNo">164</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.164"></a>
<span class="sourceLineNo">165</span>   */<a name="line.165"></a>
<span class="sourceLineNo">166</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; copyOf(<a name="line.166"></a>
<span class="sourceLineNo">167</span>      Iterable&lt;? extends E&gt; elements) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>    if (elements instanceof ImmutableMultiset) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>      @SuppressWarnings("unchecked") // all supported methods are covariant<a name="line.169"></a>
<span class="sourceLineNo">170</span>      ImmutableMultiset&lt;E&gt; result = (ImmutableMultiset&lt;E&gt;) elements;<a name="line.170"></a>
<span class="sourceLineNo">171</span>      if (!result.isPartialView()) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>        return result;<a name="line.172"></a>
<span class="sourceLineNo">173</span>      }<a name="line.173"></a>
<span class="sourceLineNo">174</span>    }<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span>    Multiset&lt;? extends E&gt; multiset = (elements instanceof Multiset)<a name="line.176"></a>
<span class="sourceLineNo">177</span>        ? Multisets.cast(elements)<a name="line.177"></a>
<span class="sourceLineNo">178</span>        : LinkedHashMultiset.create(elements);<a name="line.178"></a>
<span class="sourceLineNo">179</span><a name="line.179"></a>
<span class="sourceLineNo">180</span>    return copyOfInternal(multiset);<a name="line.180"></a>
<span class="sourceLineNo">181</span>  }<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span>  private static &lt;E&gt; ImmutableMultiset&lt;E&gt; copyOfInternal(E... elements) {<a name="line.183"></a>
<span class="sourceLineNo">184</span>    return copyOf(Arrays.asList(elements));<a name="line.184"></a>
<span class="sourceLineNo">185</span>  }<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>  private static &lt;E&gt; ImmutableMultiset&lt;E&gt; copyOfInternal(<a name="line.187"></a>
<span class="sourceLineNo">188</span>      Multiset&lt;? extends E&gt; multiset) {<a name="line.188"></a>
<span class="sourceLineNo">189</span>    return copyFromEntries(multiset.entrySet());<a name="line.189"></a>
<span class="sourceLineNo">190</span>  }<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span>  static &lt;E&gt; ImmutableMultiset&lt;E&gt; copyFromEntries(<a name="line.192"></a>
<span class="sourceLineNo">193</span>      Collection&lt;? extends Entry&lt;? extends E&gt;&gt; entries) {<a name="line.193"></a>
<span class="sourceLineNo">194</span>    long size = 0;<a name="line.194"></a>
<span class="sourceLineNo">195</span>    ImmutableMap.Builder&lt;E, Integer&gt; builder = ImmutableMap.builder();<a name="line.195"></a>
<span class="sourceLineNo">196</span>    for (Entry&lt;? extends E&gt; entry : entries) {<a name="line.196"></a>
<span class="sourceLineNo">197</span>      int count = entry.getCount();<a name="line.197"></a>
<span class="sourceLineNo">198</span>      if (count &gt; 0) {<a name="line.198"></a>
<span class="sourceLineNo">199</span>        // Since ImmutableMap.Builder throws an NPE if an element is null, no<a name="line.199"></a>
<span class="sourceLineNo">200</span>        // other null checks are needed.<a name="line.200"></a>
<span class="sourceLineNo">201</span>        builder.put(entry.getElement(), count);<a name="line.201"></a>
<span class="sourceLineNo">202</span>        size += count;<a name="line.202"></a>
<span class="sourceLineNo">203</span>      }<a name="line.203"></a>
<span class="sourceLineNo">204</span>    }<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>    if (size == 0) {<a name="line.206"></a>
<span class="sourceLineNo">207</span>      return of();<a name="line.207"></a>
<span class="sourceLineNo">208</span>    }<a name="line.208"></a>
<span class="sourceLineNo">209</span>    return new RegularImmutableMultiset&lt;E&gt;(<a name="line.209"></a>
<span class="sourceLineNo">210</span>        builder.build(), Ints.saturatedCast(size));<a name="line.210"></a>
<span class="sourceLineNo">211</span>  }<a name="line.211"></a>
<span class="sourceLineNo">212</span><a name="line.212"></a>
<span class="sourceLineNo">213</span>  /**<a name="line.213"></a>
<span class="sourceLineNo">214</span>   * Returns an immutable multiset containing the given elements.<a name="line.214"></a>
<span class="sourceLineNo">215</span>   *<a name="line.215"></a>
<span class="sourceLineNo">216</span>   * &lt;p&gt;The multiset is ordered by the first occurrence of each element. For<a name="line.216"></a>
<span class="sourceLineNo">217</span>   * example,<a name="line.217"></a>
<span class="sourceLineNo">218</span>   * {@code ImmutableMultiset.copyOf(Arrays.asList(2, 3, 1, 3).iterator())}<a name="line.218"></a>
<span class="sourceLineNo">219</span>   * yields a multiset with elements in the order {@code 2, 3, 3, 1}.<a name="line.219"></a>
<span class="sourceLineNo">220</span>   *<a name="line.220"></a>
<span class="sourceLineNo">221</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.221"></a>
<span class="sourceLineNo">222</span>   */<a name="line.222"></a>
<span class="sourceLineNo">223</span>  public static &lt;E&gt; ImmutableMultiset&lt;E&gt; copyOf(<a name="line.223"></a>
<span class="sourceLineNo">224</span>      Iterator&lt;? extends E&gt; elements) {<a name="line.224"></a>
<span class="sourceLineNo">225</span>    Multiset&lt;E&gt; multiset = LinkedHashMultiset.create();<a name="line.225"></a>
<span class="sourceLineNo">226</span>    Iterators.addAll(multiset, elements);<a name="line.226"></a>
<span class="sourceLineNo">227</span>    return copyOfInternal(multiset);<a name="line.227"></a>
<span class="sourceLineNo">228</span>  }<a name="line.228"></a>
<span class="sourceLineNo">229</span><a name="line.229"></a>
<span class="sourceLineNo">230</span>  ImmutableMultiset() {}<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span>  @Override public UnmodifiableIterator&lt;E&gt; iterator() {<a name="line.232"></a>
<span class="sourceLineNo">233</span>    final Iterator&lt;Entry&lt;E&gt;&gt; entryIterator = entrySet().iterator();<a name="line.233"></a>
<span class="sourceLineNo">234</span>    return new UnmodifiableIterator&lt;E&gt;() {<a name="line.234"></a>
<span class="sourceLineNo">235</span>      int remaining;<a name="line.235"></a>
<span class="sourceLineNo">236</span>      E element;<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span>      @Override<a name="line.238"></a>
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